#50 in Aquarium Heaters. It is specially designed for small fish tanks and does not occupy any space. Upgrade the chip to make the temperature sensing more sensitive and the temperature rise more accurate.
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hygger Small Aquarium Betta Heater, Submersible Fish Tank Heater 10W/25W/50W/…
Manufacturer : hygger. Manufacturer: hygger. Super Mini Size: This small aquarium heater is thumb size – only 4.1 (10.5cm) in length. Great for nano tanks / betta tanks. Takes up less space, easy to hide, but in full power!